The working principle of the diesel generator set four-stroke diesel engine is as follows:
1. Intake process As shown in Figure 1-a, the piston moves from the top dead center to the bottom dead center. At this time, the intake valve is opened and the exhaust valve is closed under the action of the air distribution mechanism. As the internal volume of the piston cylinder increases, the pressure decreases, fresh air is continuously sucked into the cylinder through the air filter and the intake pipe. Due to the resistance of the air intake system, the gas pressure in the cylinder at the end of the intake is lower than the atmospheric pressure P0 (about 78 to 91 KPA) and the temperature is 320 to 340K.
2. Compression process As shown in Figure 1-b, the piston moves from the bottom dead center to the top dead center, at which point the exhaust valve closes. The internal volume of the cylinder is continuously reduced, the gas is compressed, and its temperature and pressure constantly increase. At the end of the compression, the gas pressure can reach 3~5MPA and the temperature can reach 750~1000K, creating the conditions for the evaporation, mixing and combustion of the diesel injected into the cylinder.
3, the work process shown in Figure 1-c shows, at the end of the compression process, the injector will spray diesel oil into the cylinder with a small oil mist, quickly evaporate under high temperature, high pressure and high velocity air flow, mixed with air, Mixture is formed. At high temperatures, it burns automatically and emits a lot of heat, which causes the gas temperature and pressure in the cylinder to rise sharply. The maximum pressure of the gas can reach 6~9MPA, and the maximum temperature can reach 1800~2000K. The high pressure gas expansion pushes the piston to move from the top dead center to the bottom dead center, so that the crankshaft rotates to do work externally. Since the injection and combustion will continue for a period of time, although the piston begins to move downwards, the injected fuel continues to burn and release heat, the pressure in the cylinder does not drop significantly, and the temperature in the cylinder changes as the piston moves down. And pressure gradually declined. At the end of the power stroke, the pressure is about 0.2~0.5 MPA.
4. Exhaust process As shown in Figure 1-d, after the work process is completed, the exhaust valve opens and the intake valve closes. The piston moves from bottom dead center to top dead center under the crankshaft. The burned exhaust gas leads the pressure difference and the piston's upward displacement, and is quickly discharged from the exhaust valve. Due to the resistance of the exhaust system, the exhaust pressure in the cylinder is slightly higher than the atmospheric pressure at the end of the exhaust. Residual exhaust gas pressure in the cylinder is about 0.105~0.12 MPA, and the temperature is about 700~900K.
After the piston passes through the above four consecutive processes, it completes a work cycle. When the exhaust process is over, the crankshaft of the diesel engine continues to rotate due to the inertia of the flywheel, and the above four processes are repeated. One after another work cycle is carried out so that the diesel engine continuously operates to drive the work machine to do work.
Commercial Treadmill
Commercial treadmills are mainly used in professional places with high usage such as gyms, clubs, and star rated hotels, with running belts generally between 45-65. Unlike home treadmills, commercial treadmills use an AC motor+frequency converter drive method, which can run for longer periods of time without causing the motor to burn out.
As a fitness equipment manufacturer with 20 years of experience, we have a complete supply chain that can better meet customer needs, improve product quality and service levels, as well as reduce costs and improve efficiency.
The following are the advantages of our company's supply chain:
1. High quality supplier relationships. We establish long-term partnerships with high-quality suppliers to obtain stable and high-quality raw materials and components to support their product production and service provision. Ensure product reliability and consistency, and improve customer satisfaction.
2. Advanced information technology systems. Utilize advanced information systems to support supply chain management and decision-making. These information technology systems can track logistics, inventory, and order information in real-time, enabling companies to better plan production, schedule freight, and control inventory.
3. Flexible supply chain network. Through a flexible supply chain network, we can better adapt to market changes and customer demands, reducing risks and uncertainties in the supply chain. This flexibility enables our company to respond to market competition and opportunities in a timely manner, improving production efficiency and customer satisfaction.
Is it worth buying a commercial gym treadmill?
Spending more upfront on commercial treadmills offers several benefits: Withstands high traffic and hours of use without breaking down. Advanced features better suit the gym/training environment. Covered by warranty when used properly.
What's the difference between a commercial treadmill and a regular treadmill?
Commercial electric treadmills are designed for heavy usage and are built with high-grade materials, making them more durable than home running machines. On the other hand, home treadmills are suitable for individuals who have limited time to exercise or prefer to workout in the comfort of their own homes